Alot of people do about 1/4-1/3 of the switch and get the next load in about a week. I would suggest that instead of the whole substrate at one time. I know Roka64 did it like that with his tank. Maybe he`ll be on here in a while. I hope all goes well.

__________________

__________________SITE ADMINISTRATOR

You can view many of my fish and corals in my photo albums in my profile.

If taking the fish out and planning another cycle then I'd do it all at once.

I was the one that recommend Scott do 1/4 per week because he was keeping his fish in the tank at the time and the full replacement would have put too much of a strain on his bacterial colony and I was worried about nh3 spikes.

Yup, that was me and thanks for the advice tec. I did do 1/4 per week, I had fish and inverts in the tank. I like to be on the safe side, that's why I did 1/4 a week. I also had spare, premixed water just in case. I didn't have any fatalities, only a few nipped fins.

+++EDIT+++
I think I still have your PMs, for doing it.

__________________Age is relative, you are only as old as you act....of course, this works in reverse....